feat: 完成API测试、生产环境配置和文档编写

## 🧪 API测试系统完善
- 创建完整的单元测试套件 (tests/unit_test.go)
  - 认证流程、CRUD操作、文件上传测试
  - 中间件、错误处理、性能测试
- 创建集成测试套件 (tests/integration_test.go)
  - 业务流程、数据一致性、并发测试
- 创建综合API测试 (test_api_comprehensive.http)
  - 92个测试场景，覆盖所有API端点
- 更新Makefile添加测试命令
  - test-unit, test-integration, test-api, test-cover, test-bench

## 🗄️ 生产环境数据库配置
- Docker Compose生产环境配置 (configs/docker/docker-compose.prod.yml)
  - PostgreSQL 16 + Redis 7 + Nginx + 监控栈
- 数据库初始化脚本 (configs/docker/init-db.sql)
  - 完整表结构、索引优化、触发器、视图
- 生产环境配置脚本 (scripts/production-db-setup.sh)
  - 自动化配置、连接池、备份策略、监控

## 📚 API文档完善
- 完整的API文档 (docs/API_DOCUMENTATION.md)
  - 详细接口说明、请求响应示例
  - 认证流程、错误处理、性能优化
  - SDK支持、部署指南、安全考虑
- 包含cURL示例和Postman Collection支持

## 📊 项目进度
- 总进度: 50.0% → 57.5%
- 中优先级任务: 55% → 70%
- 并行完成3个重要任务，显著提升项目完成度

## 🎯 技术成果
- 测试覆盖率大幅提升，支持自动化测试
- 生产环境就绪，支持Docker部署
- 完整的API文档，便于前后端协作
- 性能优化和监控配置，确保生产稳定性

backend/configs/docker/docker-compose.prod.yml

@@ -0,0 +1,176 @@
+version: '3.8'
+
+services:
+  # PostgreSQL 数据库
+  postgres:
+    image: postgres:16-alpine
+    container_name: photography-postgres
+    environment:
+      POSTGRES_DB: photography
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-photography_prod_2024}
+      POSTGRES_INITDB_ARGS: "--auth-local=md5 --auth-host=md5"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+      - ./init-db.sql:/docker-entrypoint-initdb.d/init-db.sql:ro
+    networks:
+      - photography-network
+    ports:
+      - "5432:5432"
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    deploy:
+      resources:
+        limits:
+          memory: 512M
+        reservations:
+          memory: 256M
+
+  # Redis 缓存
+  redis:
+    image: redis:7-alpine
+    container_name: photography-redis
+    command: redis-server --appendonly yes --requirepass ${REDIS_PASSWORD:-redis_prod_2024}
+    volumes:
+      - redis_data:/data
+    networks:
+      - photography-network
+    ports:
+      - "6379:6379"
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    deploy:
+      resources:
+        limits:
+          memory: 256M
+        reservations:
+          memory: 128M
+
+  # 后端 API 服务
+  api:
+    build:
+      context: ../..
+      dockerfile: configs/docker/Dockerfile
+      target: production
+    container_name: photography-api
+    environment:
+      - ENV=production
+      - DATABASE_HOST=postgres
+      - DATABASE_PORT=5432
+      - DATABASE_NAME=photography
+      - DATABASE_USER=postgres
+      - DATABASE_PASSWORD=${POSTGRES_PASSWORD:-photography_prod_2024}
+      - REDIS_HOST=redis
+      - REDIS_PORT=6379
+      - REDIS_PASSWORD=${REDIS_PASSWORD:-redis_prod_2024}
+      - JWT_SECRET=${JWT_SECRET:-photography-jwt-secret-prod-2024}
+      - FILE_UPLOAD_MAX_SIZE=10485760
+      - CORS_ORIGINS=https://photography.iriver.top,https://admin.photography.iriver.top
+    volumes:
+      - upload_data:/app/uploads
+      - ./logs:/app/logs
+    networks:
+      - photography-network
+    ports:
+      - "8080:8080"
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8080/api/v1/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+    deploy:
+      resources:
+        limits:
+          memory: 512M
+        reservations:
+          memory: 256M
+
+  # Nginx 反向代理
+  nginx:
+    image: nginx:alpine
+    container_name: photography-nginx
+    volumes:
+      - ./nginx.conf:/etc/nginx/nginx.conf:ro
+      - ./ssl:/etc/nginx/ssl:ro
+      - upload_data:/usr/share/nginx/html/uploads:ro
+    networks:
+      - photography-network
+    ports:
+      - "80:80"
+      - "443:443"
+    depends_on:
+      - api
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  # 监控服务 (可选)
+  prometheus:
+    image: prom/prometheus:latest
+    container_name: photography-prometheus
+    command:
+      - '--config.file=/etc/prometheus/prometheus.yml'
+      - '--storage.tsdb.path=/prometheus'
+      - '--web.console.libraries=/etc/prometheus/console_libraries'
+      - '--web.console.templates=/etc/prometheus/consoles'
+      - '--storage.tsdb.retention.time=200h'
+      - '--web.enable-lifecycle'
+    volumes:
+      - ./prometheus.yml:/etc/prometheus/prometheus.yml:ro
+      - prometheus_data:/prometheus
+    networks:
+      - photography-network
+    ports:
+      - "9090:9090"
+    restart: unless-stopped
+
+  # 日志收集 (可选)
+  grafana:
+    image: grafana/grafana:latest
+    container_name: photography-grafana
+    environment:
+      - GF_SECURITY_ADMIN_PASSWORD=${GRAFANA_PASSWORD:-admin123}
+      - GF_USERS_ALLOW_SIGN_UP=false
+    volumes:
+      - grafana_data:/var/lib/grafana
+      - ./grafana/provisioning:/etc/grafana/provisioning:ro
+    networks:
+      - photography-network
+    ports:
+      - "3000:3000"
+    depends_on:
+      - prometheus
+    restart: unless-stopped
+
+networks:
+  photography-network:
+    driver: bridge
+
+volumes:
+  postgres_data:
+    driver: local
+  redis_data:
+    driver: local
+  upload_data:
+    driver: local
+  prometheus_data:
+    driver: local
+  grafana_data:
+    driver: local